Artificial-silk-spinning machine



Nov. 11, 1930. P. HILLEBRAND ARTIFICIAL SILK SPINNING MACHINE Filed Jan. 28, 1926 2 Sheets-Sheet 1 T v0 r. www wa w u m P ,ni W

Nov. 1,1, 1930.

P. HILLEBR'AND ARTIFICIAL SILK SPINNING MACHINE Filed Jan. 2,8, 1926 2 Sheets-Sheet 2 fnVenorg 450 stantly renewed.

tact with the air is therefore constantly Patented Nov. 11', 1930 UNITED STATES PAKTEIN'E',A OFFICESv PAUL HILLEBRAND, OF 'W'RDOI-IL,` GERNLAN'Y, ASSIGNOR T0 PUMPENFABRIK PAUL HILLEBRAND G. Ill'. B. H., OF WERDOI-IL, ('JrERlVIllLNY` Application led January 28, 1926, Serial No. 84,407, and in Germany March 4, 1925.

vThe present inventionvrefers to artificialsilk .spinning machines of that character wherein a pressure-equahzlng chamber formed 1n the manner of an air-vessel 1s ar- 5 ranged between the pump for propelling the liquid to be spun and the spinning nozzle. In prior spinning machines of this character the spinning liquid issuing from thev pump enters at some depth below the level of the liquid, namely, at the lower end of the airvessel and at the same level as that whereat the liquid again leaves the air-vessel. The consequence of this is that only the lower portion of the liquid contained in the air-vessel is continuously renewed,`y while on the other quickly and thus loses its elasticity so that the pressure variations caused bythe pump are no longer buered by the air in theV air-vessel. The pressure variations on the f other hand, continue 1n the duct leading` to the spinning nozzle and cause marked inequalities in the thickness of the threads of artificial silk produced. y

This drawback'is obviatedrby ther present invention, in which thespinning liquid is so introduced,into'the airevessel at a level located at least at the height of the liquid-level in the air-vessel or ata still greater height and in which the spinning liquid is discharged from the air-vesselV below the liquid-level and preferably from the lowerv end of the airvessel. By this method no longer merely the lower portion of the liquid in the air-vessel but the entire liquid-column contained in said vessel is maintained in constant flux and con- The surface layer in conchanging so that this layer can no longer stiifen or solidify. The elasticity of the liquid in the air-vessel is 'therefore constantly maintained so that the pressurevariationsset up by the working of the pump can be equalized by the compression and expansion of the air in the air-vessel and consequently threads of uniform thickness may be continu- ?9 ally produced.

sure-equalizing chamber through an overflow pipe opening into the` upper portion of. the latter. Y f Y y Two forms of apparatus for carrying out the invention are shownby way of example in the accompanying drawing, wherein Fig. 1 shows a pressure-equalizing charnber mounted directly on the pump and arranged in accordance with the present invention, and n i Fig. 2 showsthe chamber mounted on the duct which connectsthe pump withy the spinning nozzle. v

Fig. 3 is a verticalcross-section through one-half of a spinning machine for viscose silk, showing the application Aofmy invention according to Fig. l thereto.

Fig. l is a fragmental viewvin lelevation 1from the operative side ofthe machine, i. e., from the right hand side of Fig. 1.*V i A 1 Referring to' the drawing, the` drum a of thepump rotates in the cylinder b and contains four axial bores c in each of which moves a piston (not shown). From each bore c a transverse bore d leads .to two arcuate groovesV 7, Vg each occupying somewhat less than half the circumference of the casing, of

raf

vso

which grooves the'one f is connected to the supply duct 71, and to the other is connected an overflow, pipe la leading into the air-vessel z'. The said overflow pipe-k opens intothe upper portion of the air-vessel and therefore at aiplace which is' above the highest liquidlevel existing in practice, this level fluctuating possibly about the line S. The air-vessel i is closed above, andkbelowV isk mounted on a flangedfacing n on the cylinder b, avpacking ring m being inserted between. A bridge piecevo fastened to the cylinder b embraces the air-vessel'z'. In a threaded-hole p of thek bridge-piece is larranged a spindle l1^ provided with a handle aV and capable yof being screwed down, so pressing at its lower end against theair-vesselz'.

The overflow pipe second, but shorter pipe s which terminates Vin the lower portion ofthe air-vessel andV k is surrounded; by i iop, y

servesV for conductingy away the spinning liq'- uid. To lthis pipe is connected the duct t leading to they spinning nozzle.

yIn the modification shown in Fig. 2 the airvessel z is mounted on a union u connected in the duct between the pump and the spinning nozzle, into thethreaded holes fv, fw of whichr union are screwed the supply and de-V livery pipes. The hole o is .connected by a duct w tOhe overflow pipe and the holey ,by @duct @j to the discharge dm 8 TheV liquid flowing through vthe pipe 7c distributes it'self on the 'surface of the liquid contained 'in the Lair-vessel "'i. 'll-he liquid flowing away through'the pipe s, on the other hand, is withdrawn from thelayer of liquid existent at the'lower portion of the air-vessel. There thusl occurs within vthe air-vessel a con- Y i tinuousilow of liquid downwardly sojthat no particles of liquid remain constantly in the airfvessel. Y

Y Inlorderrthat my invention -ingits application may be fully-understood, I' have shownV in Figs. 3 and t'itsmode of use, in the form shown in F 1g. 1,fin a machine for spinning viscose silk.k As show-n, 5, 6 is the frame of the machine, which carries on each side of its longitudinal middle plane a series 'of spinninguni'ts. Each suchiinit includes a feed pump 7j for thel spinning solution with com` Y niunicating .pressure eqlualizer vl, a spinneret f Scarried byA a swingab epipe 7, and a takeup device for the spun thread; The pipe 7 vwith the'spinneret extends intothe precipi-V `tant`9"contained within a trough 10 extend-V ingalongthe entire length'of the machine 11` denotes the feed pipe `common to a series vit of spinning units for feedinggthe @spinning solution,fwliich feed pipe is connected with the individual pumpsyb by means'ofbran'ch pipes 13, each provided with ai/ cutfo and discharge valve 12'.y yThe branch'pipes ,com-fv Y f 'municate with a borefof'rthe journalV cheeks 14, whichboreialso communicates with the Asucking-side of the pump b, which latter can be swung about a horizontal axis formed by spinneretS. ,The.journalcheek-bore,in turn,

rtrunnions n 15. v,The pressure kside'v of. the

pump b Ycommunicates through one of these of solution therein;`

` bination withv a spinning liquid supply pump, Y

and a spinning nozzle, of a pressure equalizing chamber disposed between the .pump and n nozzle, said chamber having an inlet comf municating with the pump andy serving to deliver the liquid into V.the chamber at or above the normal working level of the liquid in the chamber, and said chamber having a liquid discharge outlet leading to the nozzle. from a Joint belowthe normal worlringlev'el of the liquid inthe chamber.

and ai spinning nozzle, of a'pressure equalizn ingchamber disposed between the pump and the nozzle, an outlet tube projecting -ii'itouv said. chamber and free from c'ontact'the're`A`r x1 .2.;In aisill; spinningrapparatus, the comf bination with a spinning liquid supply pump l I with at: itsinner lend andat its outer end lead-*f j source, andnieans between the pump randthec spinneret for preventingy material fluctua p vtions ofv pressure vof the fluid and atmospheric'V influences affectingits degree of fluidity, said' means comprising a vesselhaving a solution receiving chamber and an air spaceV above helevel of thesolution therein, a supply conductor-for introducing the solution to said chamber vabovefthe surface level of the body of'V solution therein, land a discharge conduc-v tor forv conductingaway solution from the chamber below the surface levell ofthe body trunnions 15 which is hollow, and a pipe V16',

with a bore within one of the journal cheeks 172for the swingable pipe Ysupporting the communicatesA throughV the' hollow trunnion 18 with the'pi'pe'71and thereby the spinl neret 8'.

Y n i Eachfpump' 'b is driven fromv al common drive shaft=19 by kmeans of afwormrpmeshing with theworm Vwheel 20 of `the pump.

By swinging/the'pump about its horizontal aXisthe worm wheel 2()V may be disconnected from the shaft' worm, so, that each individual pumpmay be independentlyplaced into or outfof operation. I claim is:.

In a silkspinning apparatus,theV com- Y i f aflixmy signature.

,is i 

